DTC U3003:16 [TELEMATICS COMMUNICATION UNIT (TYPE-B)]


id1602a7009500


Outline

System malfunction location

Telematics communication unit power supply voltage low input

Detection condition
•  The telematics communication unit power supply circuit voltage is lower than the standard for 10 s or more.
Fail-safe
After this DTC is detected, collision is detected within 5 s
•  Switches the power supply to the internal battery and continues the telematics communication unit operation.
After this DTC is detected, collision is not detected within 5 s
•  Turns the telematics communication unit power supply off.
Possible cause
•  DTCs are stored in the PCM.
•  Battery malfunction
•  Malfunction in generator
•  Telematics communication unit connector or terminal malfunction
•  Short to ground or open circuit in telematics communication unit power supply circuit
•  Telematics communication unit malfunction


Diagnostic Procedure

Step

Inspection

Results

Action

1
VERIFY TELEMATICS COMMUNICATION UNIT DTCs AGAIN
•  Clear the DTC recorded in the memory.
(Refer to the [CLEARING DTC] in the workshop manual)
•  Perform the DTC inspection for the telematics communication unit.
(Refer to the [DTC INSPECTION] in the workshop manual)
•  Is the same Pending DTC present?
Yes
Go to the next step.
No
Go to repair completion verification 2.
2
INSPECT PCM FOR MALFUNCTION
•  Perform the DTC inspection for the PCM.
(Refer to the [DTC INSPECTION] in the workshop manual)
•  Is a DTC displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
(Refer to the [DTC TABLE [PCM (SKYACTIV-G)]] in the workshop manual)
(Refer to the [DTC TABLE [PCM (SKYACTIV-D)]] in the workshop manual)
No
Go to the next step.
3
INSPECT BATTERY FOR MALFUNCTION
•  Inspect the applicable part.
(Refer to the [BATTERY INSPECTION] in the workshop manual)
•  Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
(Refer to the [BATTERY RECHARGING] in the workshop manual)
(Refer to the [BATTERY REMOVAL/INSTALLATION] in the workshop manual)
4
INSPECT GENERATOR FOR MALFUNCTION
•  Inspect the applicable part.
(Refer to the [GENERATOR INSPECTION] in the workshop manual)
•  Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
(Refer to the [GENERATOR REMOVAL/INSTALLATION] in the workshop manual)
5
INSPECT TELEMATICS COMMUNICATION UNIT CONNECTOR FOR MALFUNCTION
•  Inspect the applicable connector and terminal.
(Refer to the [CONNECTOR INSPECTION] in the workshop manual)
•  Are the connector and terminal normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
6
INSPECT TELEMATICS COMMUNICATION UNIT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT
•  Inspect the applicable circuit for a short to ground and open circuit.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)
•  Is the circuit normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
Repair completion verification 1
VERIFY THAT VEHICLE IS REPAIRED
•  Install/connect the part removed/disconnected during the troubleshooting procedure.
•  Clear the DTC recorded in the memory.
(Refer to the [CLEARING DTC] in the workshop manual)
•  Switch the ignition ON (engine off or on) and wait for 10 s or more.
•  Perform the DTC inspection for the telematics communication unit.
(Refer to the [DTC INSPECTION] in the workshop manual)
•  Is the same Pending DTC present?
Yes
Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual)
If the CAN communication is normal, perform the diagnosis from Step 1.
•  If the malfunction recurs, replace the telematics communication unit, then go to the next step.
(Refer to the [TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION] in the workshop manual)
No
Go to the next step.
Repair completion verification 2
VERIFY IF OTHER DTC IS DISPLAYED
•  Perform the DTC inspection.
(Refer to the [DTC INSPECTION] in the workshop manual)
•  Are any other DTCs displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
No
DTC troubleshooting completed.